fix(window): 'winbar' in single-row win overlaps global 'statusline' #41188

src/nvim/window.c

@@ -7273,16 +7273,13 @@ static bool resize_frame_for_status(frame_T *fr)
 // @return Success or failure.
 static bool resize_frame_for_winbar(frame_T *fr)
 {
-  win_T *wp = fr->fr_win;
-  frame_T *fp = find_horizontally_resizable_frame(fr);
+  int old_height = fr->fr_height;
 
-  if (fp == NULL || fp == fr) {
+  frame_setheight(fr, old_height + 1, false);
+  if (fr->fr_height == old_height) {
     emsg(_(e_noroom));
     return false;
   }
-  frame_new_height(fp, fp->fr_height - 1, false, false, false);
-  win_new_height(wp, wp->w_height + 1);
-  frame_fix_height(wp);
   win_comp_pos();
 
   return true;

test/functional/ui/winbar_spec.lua

@@ -570,6 +570,26 @@ describe('winbar', function()
                                                                   |
     ]])
   end)
+
+  it('making room for a winbar does not overlap the global statusline #41140', function()
+    n.exec([[
+      set winbar= laststatus=3
+      vsplit
+      split
+      resize 1
+      setlocal winbar=top
+      resize 1000
+    ]])
+    screen:expect([[
+      {1:top                           }│                             |
+      ^                              │{3:~                            }|
+      {3:~                             }│{3:~                            }|*7
+      ──────────────────────────────┤{3:~                            }|
+                                    │{3:~                            }|
+      {4:[No Name]                                                   }|
+                                                                  |
+    ]])
+  end)
 end)
 
 describe('local winbar with tabs', function()